<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>

		p,div,h1,.yao {
			color: #f00;
		}
	</style>
</head>
<body>
	<p>香蕉</p>
	<p>橘子</p>
	<div>大白菜</div>
	<div>辣椒</div>
	<h1>米饭</h1>
	<h1>白面</h1>

	<em class="yao">我也要变色</em>
	<em>我不要变色</em>
	<em>我不要变色</em>
</body>
</html>